Ask about Lambert shader intensity

Hi everyone :slight_smile:
I’ve learned from school Lambert Intensity = Surface Normal * Light Vector. So, what does the intensity option in Blender mean? For example, if the intensity is 0.5, does it mean the area perpendicular to the incident light ‘diffuse’ as if it were in the area 60 degrees to the incident light? Thanks :slight_smile:

By the way, if my objects only reflect light, not emit it, I think there’s no need to control the ‘intensity’ of Lambert Shader to make one ‘brighter’ than others. Any ideas?